That means the rod was still connected.... - Saab 9000 Bulletin Board - Saabnet.com
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That means the rod was still connected....
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Posted by David Ingram (more from David Ingram) on Tue, 14 Nov 2006 13:29:45 Share Post by Email
In Reply to: Re: You've got that backwards., Erik919kt, Tue, 14 Nov 2006 12:22:45
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The wastegate is a plain old flap, which should open and shut like the exhaust cap on a diesel truck. Spring pressure is from a spring that sits inside the wastegate actuator (the diaphram unit that's attached to the opposite end of the wastegate rod). Boost pressure is used to overcome this spring tension and allow the wastegate to open when called for by the engine's brain.

When you remove a turbo, you remove it with the wastegate actuating diaphram and rod mechanism, all as a unit. But if you examine this assembly, you'll see what we're talking about here, which is a rod from the diaphram unit leading to a connection with the actual wastegate arm, on the turbo casting itself. These have a habit of getting separated, and when they do the wastegate is free to flop around, resulting in no boost.

You wouldn't want to build an internal spring into the turbo casting, because the extremes of heat would wreak havoc on the behavior of said spring.

It's also preferable, as you can imagine, to have the wastegate flap itself open in the event of its separation from the rod, the better to preserve vital engine bits under such a failure mode.

posted by 155.212.49...

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